專案中使用springmvc4.1.3+POI實現檔案上傳

controller層

	@RequestMapping("/excel/exportEnterpriseExcel!exportEnterprise.action") 
	public ResponseEntity<byte[]> exportEnterprise() {
		try {
			String fileName=new String(("企業資訊" + System.currentTimeMillis() + ".csv").getBytes("UTF-8"),"iso-8859-1");
			return getInputExcel(fileName);
		} catch (UnsupportedEncodingException e) {
			log.error("UnsupportedEncodingException", e);
		}
		return null;
	}
	
	private ResponseEntity<byte[]> getInputExcel(String filename) {
		String pids = getParameter("pids");
		String exportType = getParameter("exportType");
		HSSFWorkbook wb = new HSSFWorkbook();
		pager = initPager();
		try {
			pager.setPageSize(65530);
			pager.setPageNumber(1);
			wb =  eppEnterpriseService.exportEnterprise(pids,exportType,pager); 
		}catch(Exception e){
			e.printStackTrace();
		}
		ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
		try {
			wb.write(byteArrayOutputStream);
		} catch (IOException e) {
			e.printStackTrace();
		}
		HttpHeaders headers = new HttpHeaders();  
		headers.setContentType(MediaType.APPLICATION_OCTET_STREAM
 
);  
		headers.setContentDispositionFormData("attachment", filename);  
		return new ResponseEntity<byte[]>(byteArrayOutputStream.toByteArray(),headers,HttpStatus.CREATED);
	}

上面程式碼省略service與處理Excel的row與cell的過程

springmvc.XML的配置（文字轉換器部分）（錯誤的）

     <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">  
        <property name="messageConverters">  
            <list>  
                <bean class="org.springframework.http.converter.StringHttpMessageConverter">  
                    <property name="supportedMediaTypes">  
                        <list>
			    <value>text/html;charset=UTF-8</value>
			    <value>text/plain;charset=UTF-8</value>
                            <value>application/json;charset=UTF-8</value>
			</list>  
                    </property>  
                </bean>  
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                    <property name="supportedMediaTypes">
                        <list>
                            <value>application/json;charset=UTF-8</value>
                        </list>
                    </property>
                    
		</bean>
            </list>  
        </property>  
    </bean> 
 

因為在controller中使用的返回contentType是MediaType.APPLICATION_OCTET_STREAM，實際上是要將返回的資料處理成application/octet-stream型別。

所以在springmvc的文字轉換器中加入這種資料型別的文字轉換器即可。

在springmvc.XML中加入

     <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">  
        <property name="messageConverters">  
            <list>  
                <bean class="org.springframework.http.converter.StringHttpMessageConverter">  
                    <property name="supportedMediaTypes">  
                        <list>
			    <value>text/html;charset=UTF-8</value>
			    <value>text/plain;charset=UTF-8</value>
                            <value>application/json;charset=UTF-8</value>
			</list>  
                    </property>  
                </bean>  
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                    <property name="supportedMediaTypes">
                        <list>
                            <value>application/json;charset=UTF-8</value>
                        </list>
                    </property>
                    
		</bean>
 

<bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter">
  <property name="supportedMediaTypes">
     <list>
        <value>text/plain;charset=UTF-8</value>
     </list>
  </property>
</bean>